Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 115 for “"carbon fibers"”.
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Strength-structure relationships in carbon fibers
… and macrostructure of various PAN-based carbon fibres has been characterized by bright- and dark-field transmission electron microscopy, and quantitative electron-diffraction analysis. A skin-core heterogeneity was observed for all fibres heat treated to 2500°C, irrespective of type and …
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Interfacial Thermomechanical Behavior of Hybrid Carbon Fibers
<p>The carbon fiber/epoxy interface is of great importance in composite design due to its load transfer mechanisms from the weak epoxy to the stronger fiber. Improving the strength of the interface reduces the risk of failure at the interface and improves the load transfer to the fiber. In this …
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Laser treatment of Asphaltene based Carbon Fibers
Carbon fiber is a lightweight, high tensile strength, and high modulus material extensively employed in diverse industries such as aerospace, automotive, and energy. Its production involves the utilization of various precursors tailored to specific applications, based on desired mechanical …
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Novel method for carbon nanofilament growth on carbon fibers
Carbon nanofilaments were grown on the surface of microscale carbon-fibers at relatively low temperature using palladium as a catalyst to create multiscale fiber reinforcing structures with potential applications in structural composites. Employing a relatively new method, in which carbon …
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Impact Resistance of Hybrid Metal-Organic Frameworks/Carbon Fibers Composites
<p>The increase in the use of carbon fiber-reinforced polymers (CFRPs) composites in the aerospace industry generated the need of improving the properties and capabilities of these composites by adding nano-reinforcements to the carbon fibers, also called hybrid fiber reinforced polymer composites. …
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Tensile and interfacial properties of radially aligned CNT grown carbon fibers
… high mass-specific strength and stiffness of carbon fibers (CFs) has established CF reinforced plastics (CFRPs) as the benchmark material for next-generation aerospace structures. While CFRPs with radially-grown aligned carbon nanotubes (CNTs), termed fuzzy fiber reinforced plastics (FFRPs), …
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Surface characterization of plasma treated carbon fibers and adhesion to polyethersulfone
… the surface chemical composition of Hercules IM7 carbon fibers. A two-liquid tensiometric method was used to determine the surface energy parameters y(ds) and I(psf) of the fibers. An XPS analysis of air and argon plasma treated fibers indicated a significant surface oxidation of the fibers which …
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Mechanical characterization of advanced polyacrylonitrile derived carbon fibers reinforced with carbon nanotubes
… on the mechanical characterization of individual carbon fibers reinforced with carbon nanotubes (CNTs) which were dispersed in the polyacrylonitrile (PAN) precursor. The carbon nanofibers were obtained from the Georgia Institute of Technology and were fabricated in bundles by the …
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Sizing and characterization of carbon fibers with aqueous water-dispersible polymeric interphases
… is through the application of a sizing to the carbon fiber. Recent work at Virginia Tech has shown that polymer-modified interphases can lead to increases by as much as two orders of magnitude in notched fatigue lifetime. In the present work, an apparatus was constructed to uniformly coat …
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Novel interphases: Synthesis, molecular orientation and grafting of liquid crystal polymers on carbon fibers
… of nematic melts containing dispersed carbon fibers, the chemical grafting of a liquid crystal polymer to these fibers by in-situ polymerization of monomeric melts, and the synthesis and anchoring on fibers of specially designed liquid crystal monomers and polymers containing pendant …
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Investigation of transverse electrical resistivity and electrical contact resistance of carbon fibers/carbon fiber composites
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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The investigation of acid/base interactions in the adhesion of carbon fibers to thermoplastic matrices
… of the interfacial adhesion of reinforcing carbon fibers to thermoplastic polymer matrices. Inverse gas chromatography (IGC) and x-ray photoelectron spectroscopy (XPS) were used to characterize the acid/base nature of the carbon fiber surfaces. Capillary column IGC (CIGC) was used to …
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TI Nano Powder Speckle Pattern Creation and Use in DIC of ZnO Modified Single Carbon Fibers
… composites. Work has been performed in modifying carbon fibers by growing zinc oxide (ZnO) nanorods in the fiber surface using a hydrothermal approach, increasing interfacial area and fiber-matrix friction. Macroscale evaluation has shown that the interfacial modification decreases the inter-ply …
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Surface chemistry design and characterization of anion exchange and activated carbon fibers for critical contaminants removal
… The first project is to study activated carbon fiber composites (ACFCs) for removal of NH3 from air. Three series of materials were synthesized and modified, namely Polyvinyl alcohol (PVA) based Chemically Activated Carbon Fibers (CAFs) with optimized activation temperatures, Kynol based …
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Design of chemically treated activated carbon fibers for mercury removal and advanced membranes for water purification
… one is to develop chemically treated activated carbon fibers for mercury removal from power plant effluents, and the other one is to design advanced nanofiltration membranes for water purification with specific features, i.e. solvent resistance and antifouling properties. The current …
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The role of micropore size and chemical nature of the pore surface on the adsorption properties of activated carbon fibers
… isotherms of a series of progressively activated carbon fibers (ACF) with a range of surface areas from 760 $\rm m\sp2/g$ to 2420 $\rm m\sp2/g,$ prepared from phenolic precursors were examined with acetone, n-butane, benzene and nitrogen. The experimental results revealed a counter-intuitive …
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Adhesion of novel high performance polymers to carbon fibers: fiber surface treatment, characterization, and microbond single fiber pull-out test
The adhesion of carbon fibers to several high performance polymers, including a phosphorus-containing bismaleimide, a cyanate ester resin, and a pyridine-containing thermoplastic, was evaluated using the microbond single fiber pull-out test. The objective was to determine the chemical and …
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